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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c5440b1ab0c4d6c581df0a8f6209829482490374659f1b0d1a61dbb15f1d40' 
  AND token = 'RHEnyRt132aRJdoW5z/AgYy17hGQncp4tsKRoZecZ5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}